That's pretty much all you need to know right there... You can have all the skill in the world but if you never apply yourself to the task at hand then it's meaningless... If he imposed himself more in games and gave 100% each match then you might be able to point out that the players around him were not of sufficient skill to compliment his efforts but if you just come out and trudge around for 90 minutes then you can't really point the finger at anyone else for not performing well...
Hazard is a good example of a big player that showed it week in and week out.. There was a period under Mourinho where the whole team took a bit of a nose dive him included I admit but for the most part you got a buzz of anticipation that the bloke could turn a game on it's head when he came on, he made things happen, influenced the play and created and scored goals,, you just don't get that same vibe from Pogba..